a classic example going back to 2007, john mccain talking about osama bin laden. i want to play that. >> on the subject of osama bin laden, he is responsible for the deaths of thousands of innocent americans, he is now chestrating other attacks on the united states of america, we will do whatever is necessary, we will track him down, we will capture, bring him to justice and i'll follow him to the gates of hell. >> okay. >> oh, gosh. >> that was like a smile. >> yes. so that's -- you know, sort of nonverbal asin cronie. between either the content of what the person is saying and the nonverbals or the asynchronies. when you are saying you are following someone to the gates of hell, you shouldn't be smiling. viewers don't know why, but it makes them feel bad. >> there are reports that romney's team is preparing what are called zingers for tomorrow night's debate. when a candidate has been stung by one, it can be very effective. the exchange between ronald reagan and walter mondale demonstrates a very effective use of this. take a look. >> i had not make age an issue